A disorder involving repeated or recurrent headache, associated with temporary changes in diameter of the blood vessels in the head.

They are a common type of chronic headache. Common migraine accounts for almost all migraine headaches. Migraine may also appear as classical migraine (migraine preceded by other symptoms) and other forms.

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Migraines occur when blood vessels of the head and neck spasm or constrict, which decreases blood flow to the brain. Minutes to hours later, the blood vessels dilate (enlarge), resulting in a severe headache. Common migraine may be accompanied by symptoms other than headache but only rarely includes any preliminary symptoms (aura). Multiple mechanisms trigger the spasm and subsequent blood vessel dilation.